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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad89b19477eb91d48d56d5e515978c9cbdec49d9798ed45f81bf5575965b686' 
  AND token = '3qLZ824Qjh6X1Cze0WTtoYQ42vW2TnB3M0EWe8nMJuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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