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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2975e45314bda0ee097d6f3c68ead8cbe2346c75d6026e2725c89983d39beddf' 
  AND token = 'btm5RzoCFpRPTJVusYV6gZsyW71qACn5lv8RPDVvPQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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