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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a938e26e3b23395ad803735687d2dfc022823aa8662e53b856579e1a3b7c71' 
  AND token = 'AF5fq7PGkeuebVdpPsYU6BKGKWWCWbVXLe1OORt4f+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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