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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a25c789a11b67a19b078328395190c37d02428700862776c410111ff2acde4e2' 
  AND token = 'w3Q3LxbQe2MqGn+fvcTxAf2SdnA3RKC0S1Ougisle5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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