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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becfee182a37ffd6596087a7a3922de764aac9d8c8a8a7fdb267fd7d8c66e7fb' 
  AND token = 'js243Xm7fOmOSwiDPDpB40c7NJPBzoe5yfc3ZP1l+7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}