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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '922431ab90d6aa1ad1078d03b0cceaecc62c44fec7cde70e2c3b0a20e0dce31b' 
  AND token = 'qpNmrdyykTDs2cjZ4VF0OKPkwlrmP7E6SFUfCsdK6kA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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