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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1c1c084ca8198494a49fb0fff2b66880837a8a30b501a20da355fa3d7ab447' 
  AND token = 'SeOx7P0AUrm+BXWtDf/yzRTB+qQ8wlL+qiPV5gTiB5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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