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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f160991a4befc743f6fc54cf12f249a4332e333491b723a2702de9ba32fa2d33' 
  AND token = 'hrNSCoR69KCkplij4OAAamz0rsZmUJeJcSrJHbjaerE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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