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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93f7fe1e5b964a177093348d6bc55e513f060ceb370ad4940f6fdf9320201e67' 
  AND token = '2dVNg3hbEbG5ZyRGUFNRxv8bApoE75Vlfa60aCwwtMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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