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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46478b7ca10122cb2d438eff0f4190d35026301021d1b342fd50f7d56d91b72f' 
  AND token = 'r/DDBPRnLOIhoYaLw0HcWZZUPAMO5sw5qj3qSeMk8fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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