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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd69f9b459bc600c7ca87dd749302d78f5672ced113fd2bc40d79e8f2f16199de' 
  AND token = '1k7EHfl+Gkm0k71n9Gb0RnspqD7IBMMxMHn9H35dQ84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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