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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e94e048ab66b407390ce115c2bbbc9b6be7ce490de0e12417a946fa52810ea8b' 
  AND token = 'zidounbWagPAbTtxlfyC+LnbR4P+Al/xXgaqP9vFSCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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