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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a960fc04cd04ac71a258a3a7175ef11e5c119859ebbf31bbe737666ff6c4df9' 
  AND token = 'z0M1CM/fiFc/Km3lPZlia/PX5dNIBCuH5lxSrbBpBtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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