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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd67cab0e3a0061ec1e4c0c4a51def66845800a4f285d8b05c249899caf8726c3' 
  AND token = 'goujaqwBus50vJ3St9xJs4jSJYeXKv06WoEDKWzC4Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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