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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7cc8e6051e954055b6df9baa2e15fcd1ab09cfa161e9e532751ddac3895c80e' 
  AND token = 'BcP/DVA0v2ZSiLJekbMSl1p7+98nRUY07+KmJzRaxEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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