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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8867fbe746a23ceb60a4102e72c514fe94322e5830a83ce67b02f78baea431a5' 
  AND token = 'C2y3eJzGbjSCPD4R54w3tZxYLi8kbpQ5OcZ7RrSWsCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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