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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1ed8d4b2300175d1de228538e74cb44501887d2f62b942eb234dd50f41907b2' 
  AND token = 'GPGacRyzx2ipmPe34bj+RZddig0oC7CmpYe+ampKtLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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