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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ee0c1bd86d439d7e35f9e200c9ad1a74b2452fd33be956586b85fe808930817' 
  AND token = 'S7Ogkc4QCrk0ZuCII6FfPiZ4pp1T0ooUUnGmmjprHpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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