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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10e0f9d8c2037cf2ad67ba3dcfb9eea30c95182c211e605fc3f017508ae91213' 
  AND token = 'fRt6xmhOLvlPYShksh4lHjyfDg6ysySst0C6CJgNsHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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