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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddee2f87a96b050e789dd3bacc6b64ecfa6469c0b7c8b2b0eb1c5daa697c325c' 
  AND token = 'i/zcrU3/WXzgVSXhECxpeJGmcWJ8doA8BAqQH1/+m4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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