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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7542a40a6a54e38991ba197a2162d8524bb093a3240b7ab6260148bf40b9e416' 
  AND token = 'hQQF5xZdyzr9/N0Ia8PvlwuemnM9uq3IgF9Zhhu1fJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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