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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44188ea86d7aa993373ceecfcaca37545cc72f4d1b42e21ea09d88b77c168ccb' 
  AND token = 'LwYkyjn/rkgT1/4KiS5/YPIzyVkbWd/mcA5LwBX3UDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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