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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9dfc8f409c8a2a221cf14f5ea65eaa1e42a722b80435a2c5de841a1f5b86c9a' 
  AND token = 'i7clz1gFSwzh2M6cBfwfb4osmBTyeet05NsVXLbPm9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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