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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc77108bc0f6aa17dbf29e5549459701ad95e2673e1ac20b15a9cc6b19a3de5c' 
  AND token = 'BeUcbfqAzZqJTS29sZZnrvCUSFlnvqsBoPBvjmslfto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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