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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd77987d9c54f303c5ff62d35f9ec10c56a39ea2bf5ccc630fc1d3cac85c0b380' 
  AND token = 'CB4e4YF8PPGVe0UHLq7TDgue24MKqz1lGIte0u9KpcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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