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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b41f8546347653a29c629f0bbd8a59b3c9166a3103abd35717c41b4b1d52022' 
  AND token = 'd//ClqwTeO7HsWw4kyhwK467xTSdWfu/S2cUZbbjvnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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