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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0b0fbb59517a92898462cbde6c15babcf19df85f94862039f46afcb1323119' 
  AND token = 'idljguN2tmctfC/mgSyNBX2LlvLxWlo3vkj/Y4yqLTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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