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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '310022ef8e73110c507fbac852371f7194c4ac4c5994512218346b1154f643c3' 
  AND token = 'm5BV8m4YfJQhiMdDibKKAy7XzQMwmICmwatG4hbj9Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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