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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5302c63e94b029a7db83dbd2048b0406989c69ab28f5074e61c6551ae13ee21d' 
  AND token = '5W8ne0OqXcDLnFnba6nQoqfCbj7WvW5EHn9SNDcD+E8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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