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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b8753efa50444c669a9dc76cca329fb7c9be0ae550947484a6f6d712076f2d' 
  AND token = 'xWtdi3/lA68WCvhg7lEJ7SoPWTs9cQ5y1mP8AUnhswM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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