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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8644a97a6853f712d8ab26090aa85d2acfce83012ce642441b5c8eb350992331' 
  AND token = 'W5x2SRURDQEI1I2lJ3wODGWTLHjH0NBpd/M6qvoL9Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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