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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4ae048daff66b503a47022090cb050b872a3a418baa96cae80adbd1c72426ca' 
  AND token = 'ZX0y4gJc/mNKMkCK76pHW0EiHKlnA5/x1WXSdbPvHcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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