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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa6aa7706dee63763f2301593f3e1de8ee3b1074fd380d27607a53668f308e29' 
  AND token = '3XEe0DNcLOPrOBwLnHNILfZhRoElkdn8jmYcmliD0UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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