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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b3ce67fcbe333713dfb6243b31662317ca6cc3992a0893acb0a5e902c3ec2d' 
  AND token = 'oBN7ClC8vgIpMbWXKMBltWuBUcYdjWD5GjL5Dk7CkQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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