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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14fb7f4abda0e5132cfaa2d7c2e1933ba366b0a6668c5e7350a8a3141596d11f' 
  AND token = 'VE7wBG7+yS7QDqu/IwCmKYYe+StkNmhOmdn538F7aZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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