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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4273730e0b8dd3cc694eed576c85f7531a6033b7074130512990e98ea3e22e8b' 
  AND token = '/uRyx5uGF/pvvGXmgcaX8XvlspbpnRKNL9iHj7xfl/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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