SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32b670709026224d12b5e9b368364926237cd93301376e35685325739f45e4b4' 
  AND token = 'fZART/HldIQ1vcCwuuGAnLJ7weQqDklKDU3Bv+DibIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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