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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e71f317af6d27c7050bed154be946d0dcc47481ea9196e3b5de1a84b36dd993' 
  AND token = 'ct7k31ilK24Yn1BSnzjijBEWhOpowx4zkhB8yEcg9M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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