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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '411180f060ecf414ec5824706136d42e039b47247f9b64d566838cdc53e28851' 
  AND token = 'X+DIakWFHjtZee6fWPUFB32L9Ii95j44LjEGwY7suv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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