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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89718c4e8055dfc04436b457ff4ef7286b0ffaebdf58e2a6da06c30cb5c3c32f' 
  AND token = 'gkbdIHJiKBZeztGqxsfR3mHvlKD0mfUXjNLmM+s8c1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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