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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6c6ad184bbe3505e46c8fca998ad71caba9b6263ddac9cfa43479a3b44adfe' 
  AND token = 'YrLMoSj2t7d3olDTpjVLY1n+iHUOOh6QQPwqfslOw6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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