SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57eb26fb352cd5efe68af4e94bf416323032fab097f317b2ce88372ca927b068' 
  AND token = '44L9219WTBqJX/KwlN+Bv+QK7ADpUfkH6atx+dqvNPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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