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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d553cfa979c270dc7c7c8c6311c84d4f611a5e05729ca06a36631dc804b8ecf' 
  AND token = '07OTasY3MhvEMWHgCtO5oB3RriggLMMZYiv+beeBnlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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