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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e2011fadf262e1ea95e99c03ab96f1dbf85587437be3b39a9157da84c1e584' 
  AND token = 'GQGELbkAqHAQSc1in3pZekCSaagyDWit7638RB7uxq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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