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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1739f53a58261ea8be35ad5e136e63e727694faa4485580fc1067fba5f03b386' 
  AND token = 'WPPu8XzqZaQ1ZYc4xv8hYuTh7X1AjpPb9mWdagwAm2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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