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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07d0b7a8787b65d7567d5b856cd6922e7c55c312418bbb2c7d3ecf67d89b8064' 
  AND token = 'nlSHV5XSggtVrttMaqy8Mo+IpzpQa8/XC2zqUhMm7YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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