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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62f86b5c0ee607c806129fde7bfe029671835dea9eca682b0d7fae13468a4762' 
  AND token = '2vKsGkT5i9/gJBKrB35wyP63NZxSGrmPAm/RRe1tbHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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