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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a23b25ae31c169ddc6f7d6d1ce8f8831214ee0a353a6da9ddeff4fa810883c1' 
  AND token = '9KuNHREfDix6s0jLvUeqhz7PwYiOCpcC8xQ35fvbkos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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