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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbc3201abd722e075474c19e53ff874d2c50558edabef45202ccce1f389c0bb' 
  AND token = 'Mo3sD2m91VPc9yuHwv1cto0zOrrsvxRcOXfjCqAQhuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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