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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bea2e007c15241e81c233cb8c92737443971490d21984ce1ed5fed5347bcaaf' 
  AND token = 'IHFGHy2vYtIEs40fJzyA1R7tqgV14bHBek4jQ5OuwSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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