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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bb92f4522e669971800c469ba2146809c058b869ed798cfca1cd55faa9cbb07' 
  AND token = 'WvdUs9cRAPlkcCQxIgYAJNv3P9obYYshTIu2XlPCf5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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