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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f60e3913a3925edf4f9e6adefb193ecbb2df1a1cc77cd29e907874bad13a55e' 
  AND token = '64rs7MvwUKW6DvfXWNl6eUqBfoAeA7YpJYYZvylUdpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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