SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f28c9d9d8a5921f54fba046a31d1f9e78831ca6174a088e52b14cc9922bf6c5' 
  AND token = 'diz3zHSC9w8KjzDvwJVRvLAHCAZBA/e2Pr8G92MngjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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