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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccd1629318d537a80f49d4f349d4840086e0bed626aec82003a28c63f5de85cd' 
  AND token = 'vcPAKJ5/V+RBuW35oEBR5RX6BHiiESslMaosQQ6vhzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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