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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6bdbe6238cdb885e61b3ecf0931e89093c3fdcc22286091d103c0c0ee970ee5' 
  AND token = 'u4GDdMgvbD3PjAguECZl60NxIuwzNqzpmLrlR6MpGWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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