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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5913663e3b6cc7dbdc2d00d0f68667f97db5f91c42e41b4cc4b02812a6eeded0' 
  AND token = '7YZQeTdRr3idgvv6yge0ckc4tPyV3YLDtKEGZLsj5QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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