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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b2ff64ba08021860041af7b8e08f34e84e06bbd0cf6c278172b9d126c81f17c' 
  AND token = 'waYWqXtw2AwJxQnFys3ZM+h4o1ptWIFCo46Aukc8/o0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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