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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '536e13068b3616eb21274c179465d971964d529b99e8de916aa4c3d0015eb1ff' 
  AND token = 'ezZHyiStd8Z7AYsF93rG1vuYMQWOTPo4XiMAUlDZ5DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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