SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca826b4f24fdf4318a04286ed3b59deef1a24ccb82f91069b680043ab98d69b7' 
  AND token = 'NSykaxw/Y7vSuH4HNsn+3/KweFquChr3YhPHlVwiGB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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