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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c520ba0828fc6d6e07d329c48c628a0d4e89b701c5ba937789084df040fa6931' 
  AND token = 'xsPtpl4wniDeQ7wo7gbSTjx4wfRPalClyJzf8RnlHJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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