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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc3daee39a15f02aa5db7d7d31b5e28d97579b2e047202cc5949cefd057d5b90' 
  AND token = 'UHs8ZN+gCNjnBNQBUpdfl9dKe73HZ6ylLHf18uMjOGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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