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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7e6e4a680edba7512226b80815978f5ef2c16af0758f1236f4d895920d07bc6' 
  AND token = 'KuAn5JT3bPBS5SJunmP6e+PqScm01lFOzxmzNtI7WC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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