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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35d47a4a172c981ab282125aa5eca047b327010ed9001125a0afbcc67e00137a' 
  AND token = '/0FNBu4GWISq0Ka8IoaPh8RbEXR5C7zWAboDZ8dds1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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