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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89974208b3b88748d926d221ade9f5a6dee91006bef090ff776b63f1dc8fa5e' 
  AND token = '/lNR+YieNswIPeHW98BkZpZeZl4qaE7ekxpy/Gxnfso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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