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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5b09fc2a5585c34aafa9b7e1ebe5c7fce0f75ac1e1e441c80b40f444ea7c8e9' 
  AND token = 'aif548kwXCcCEHMh3R5HRjUqAlPN5GmvjXeQvGceMIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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