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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7972e2d6fff0a27c03ae2bd2218071634f671c4aecb03e561cc2a333e83d7b4' 
  AND token = '8+2n9t9WKFum/4WpuqmBoZZF/M+K/gq0RmbvXoIq1ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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