SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5026e9f509307b2bbee0a064e8a9353332c60e1b7a27124c8f93c307236df9a1' 
  AND token = 'hpl2C+Z+qKnbJ/VN+F9OPjMCkziroVXgS6FA6tVpKjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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