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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744bea5d1fb9c6930899dfee58e9209ddfc404d70c423befacd72cdde77e8300' 
  AND token = 'plOKEzSUa+Yf2kDIdKv7fY+bGKw/3ubXP9tJ+vk/UvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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