SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4de7025df556e9ba7296fef6b6762897ee2a53591d17b599e38fa441cb194f1f' 
  AND token = 'HWeFPjwDLaF/AIYRGKk+KPcomG/bZRathjpa72fyGig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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