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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '250cd9b34c9220f632780419490510fd6194941f87a0ad46b3b028ce3696bb96' 
  AND token = '6rmJ6HS2H4ZyiVDrwH2+XXdxrL/Tc2Qh1ia/L1omMMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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