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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc9f1d9b177a60e474b5c952a071b224ea3c37bc83ad16e53e0f0647cf9b16c' 
  AND token = '3lQjL5rHtORehE8XgilUquWJeCzK2qdyfZKJn7aCzSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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