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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7385c07b08a17466d9566f8cf42df7d4ebdfda0282cfc9a970ebdf4f5f94ec88' 
  AND token = 'mKORDKQw5lwLrnqtZoYWtA8Q9/U2JSw1fw7vq/a/JsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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