SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7df080ac6fbd0ea64ce409c8ebdcf3cd071ec68804efa4325b116bdb347837f7' 
  AND token = 't9lg9pJTo/3Eovqx+BxjV/zH47Z7H+vhfEuU8xCDejY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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