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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dde3fa2cdbcf37b3065c2eb4df45211f0742ad7a2f772485a57e13c79d7d94cd' 
  AND token = 'vJjrdYa3KHwUYEUZShz12Jt5UbpyepE5CuVv+whSJtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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