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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da1fd19f3d75eefca75f5c342d42e30719da7472fdc1193b193efb620eed5bdd' 
  AND token = 'lSiA9GxaO87dFI1VoDu94Ijou/VebExONu0J+BP7cEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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