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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f58deba914a69d1b5da1fe4f7dadad5bc678dda0491522db976a8811e729e4fa' 
  AND token = '7RbrIBFyzCbfsK4hw1cT9h1ukechlKRTomDzNn3Hld4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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