SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '332b8f119975bf191eaaa77a41cd67f8027f2605e121e06d319b97784ce4a7ec' 
  AND token = 'TwtDURJB3sjje+1Vtv/lxhbQq+b+DBzbTgknZeq4Ykk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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